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MLS. I have run a few thousand miles on my 18psi boosted motor with no issues. I'm not one to dyno a high number and go around driving like a weenie either. If my car is out of the garage, keep your children in the house.
We can get you either gasket you choose. We have the GM MLS gaskets on the shelf as well as Cometic 4.035" gaskets in .040, .045, .051 thicknesses. Let us know if we can help!